问题描述
std :: filesystem ，而许多C ++ 17之前的编译器的 std :: experimental :: filesystem ，均基于 boost :: filesystem ，几乎所有这些都可以移植到较新的std.
std::filesystem on C++17, and std::experimental::filesystem for many pre-C++17 compilers, are based on boost::filesystem and almost all of it is obvious to port to the newer std.
但是我看不到与 boost :: filesystem :: unique_path()等效的 std :: filesystem .
But I see no std::filesystem equivalent to boost::filesystem::unique_path().
std中有没有引起我注意的等效项吗?还是我应该采用一种推荐的方法来模仿实现?
Is there an equivalent in std that I'm not noticing? Or is there a recommended approach I should take to mimic the implementation?
当我的代码注意到它在支持 std :: filesystem 和的平台上编译时，我真的希望替换是我转换中唯一不明显的部分. boost :: filesystem 依赖项unique_path()
I'm really hoping to replace the boost::filesystem dependency when my code notices it's compiling on a platform that supports std::filesystem, and unique_path() is the only not obvious part of my conversion.
推荐答案
unique_path 已被删除，因为它是恶意软件的潜在攻击媒介.在调用 unique_path 和在该位置打开文件之间存在一个机会之窗，在此期间其他一些过程可以创建相同的文件.根据用户对文件的处理方式，这可能会或可能不会构成安全漏洞.POSIX函数 tmpnam .
unique_path was removed because it was a potential attack vector for malware. There is a window of opportunity between calling unique_path and opening a file at that location during which some other process could create the same file. Depending on what the user does with the file, this may or may not constitute a security vulnerability. A similar issue exists with the POSIX function tmpnam.
如此讨论所述，该问题将在下一版的文件系统库.在此之前，您可以继续使用 Boost.Filesystem ，使用 std :: tmpnam < cstdio> 中提供的功能，或者使用更安全的平台特定替代方案，例如 mkstemp .
As noted in this discussion, this issue will be dealt with in the next iteration of the Filesystem library. Until then, you can either continue using Boost.Filesystem, use the std::tmpnam function provided in <cstdio>, or use safer platform-specific alternatives like mkstemp.
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